Research Areas:
Link Atomistic to Continuum
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CG Simulation of Dislocations
Multiscale Thermal Transport
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Dislocation-Interface Interactions
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Bio-inspired Composites
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Materials under Irradiations
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Brittle-to-Ductile Fracture
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High-pressure Phase Transitions
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Nanostructured Ceramics
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Recently, in our group, the CG models were applied to characterize the complex dislocation elastodynamics, including the energy intensity and the wavelength of phonon waves emitted from fast moving dislocations, and the velocity-dependent core stress field, in anisotropic crystalline materials subjected to an intermediate and high strain rate loading. Mach cones in a V-shaped pattern of the phonon wave-fronts are observed in the wake of the supersonic dislocations (figures and movies as shown below). Our CG approach was demonstrated to be a predictive multiscale method that explicitly treats the strong coupling between the long-range elastic field away from the dislocation core, the highly nonlinear time-dependent stress field within the core, and the reconfiguration of the dislocation core structure.
References:
- Xiong, L., Tucker, G., McDowell, D.L., and Chen, Y., 2011. Coarse-grained atomistic simulation of dislocations, Journal of Mechanics and Physics of Solids, 59, 2, 160-177. doi:10.1016/j.jmps.2010.11.005
- Xiong, L., McDowell, D.L., and Chen, Y., 2012. Nucleation and growth of dislocation loops in Cu, Al, and Si by a concurrent atomistic-continuum method, Scripta Materialia, 67, 633-636. doi:10.1016/j.scriptamat.2012.07.026
- Xiong, L., Rigelesaiyin, J., Chen, X., Xu, S., McDowell, D.L., and Chen, Y., 2016. Coarse-grained elastodynamics of fast moving dislocations, Acta Materialia, 104, 143-155. doi:10.1016/j.actamat.2015.11.037